As of early 2026, there are 138 national monuments in the United States. These protected areas are established either by a presidential proclamation under the Antiquities Act of 1906 or through an act of Congress. Unlike National Parks, which can only be created by Congress, National Monuments allow for the rapid protection of sites with significant historical, cultural, or scientific value. These monuments are managed by a variety of federal agencies: the National Park Service (NPS) oversees the majority (89), but the Bureau of Land Management (BLM), U.S. Forest Service (USFS), and U.S. Fish and Wildlife Service also manage significant portions of the system. The list includes iconic sites like the Statue of Liberty and Devils Tower, as well as vast marine monuments in the Pacific Ocean. Because the President has the power to designate new monuments at any time, this number can fluctuate; several new sites have been proposed in 2026 to protect Indigenous heritage and fragile desert ecosystems in the American West.